I just received 55lbs of Maris Otter. Like a dumb arse, I left the "yes" checked for the milled option so I now have 55lbs of milled Maris Otter. How long will this keep good? I have it in 2 five gallons food grade buckets with sealed lid. Or should I go and brew with Maris Otter like a mad man? Thx in advance